Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	RSUs	PSUs	Total common shareholders' equity	Total common shareholders' equity RSUs	Total common shareholders' equity PSUs	Common stock	Common stock RSUs	Common stock PSUs	Additional paid-in capital	Additional paid-in capital RSUs	Additional paid-in capital PSUs	Retained earnings	Accumulated other comprehensive income (loss), net	Noncontrolling interest
Beginning balance at Dec. 31, 2021	$ 1,432,695			$ 1,432,602			$ 47,549			$ 892,529			$ 486,666	$ 5,858	$ 93
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to FB Financial Corporation and noncontrolling interest	35,236			35,236									35,236		0
Other comprehensive income (loss), net of taxes	(77,402)			(77,402)										(77,402)
Repurchase of common stock	(6,203)			(6,203)			(145)			(6,058)
Stock based compensation expense	2,582			2,582			1			2,581
Restricted stock units vested and distributed, net of shares withheld		$ (1,488)			$ (1,488)			$ 68			$ (1,556)
Shares issued under employee stock purchase program	687			687			15			672
Dividends declared	(6,238)			(6,238)									(6,238)
Ending balance at Mar. 31, 2022	1,379,869			1,379,776			47,488			888,168			515,664	(71,544)	93
Beginning balance at Dec. 31, 2022	1,325,518			1,325,425			46,738			861,588			586,532	(169,433)	93
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to FB Financial Corporation and noncontrolling interest	36,381			36,381									36,381		0
Other comprehensive income (loss), net of taxes	19,867			19,867										19,867
Repurchase of common stock	(4,944)			(4,944)			(136)			(4,808)
Stock based compensation expense	2,285			2,285			1			2,284
Restricted stock units vested and distributed, net of shares withheld	(1,452)	$ (1,145)		(1,452)	$ (1,145)		92	$ 60		(1,544)	$ (1,205)
Shares issued under employee stock purchase program			$ 321			$ 321			$ 8			$ 313
Dividends declared	(7,042)			(7,042)									(7,042)
Ending balance at Mar. 31, 2023	$ 1,369,789			$ 1,369,696			$ 46,763			$ 856,628			$ 615,871	$ (149,566)	$ 93